I'm posting one puzzle, riddle, math, or statistical problem a day. Try to answer each one and post your answers in the comments section. I'll post the answer the next day. Even if you have the same answer as someone else, feel free to put up your answer, too!
Monday, May 01, 2006
Fill 'er up
Fill in the missing numbers in the 4x4 grid such that the rows, columns and the two diagonals all add up to the same number: